<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title>01_模块化计算机</title>
	</head>

	<body>
		<input type="text" name="" id="n1"> + <input type="text" name="" id="n2">
		<button id="btn">=</button>
		<input type="text" name="" id="result" />
	</body>

</html>